JY PERFORMANCE Universal 21 Circuit Wiring Harness Kit Extra Long Wire Standard Color 17 Fuses for GM Chevy Mopar Hotrods Ford Chrysler

Lengths are good. Quality is good. Pliable wires with many stands inside the wiring. Flasher relays are cheapo's but this harness is 1/5 the cost of the big brand versions found online. If they fail I'll buy the expensive $10 relays. I have a 37 International D-2 ratrod. I have AC and electric windows so needed the expanded capabilities of the harness. If you've never wired a car and don't understand electrical schematics the directions might seem poor. If you can typically troubleshoot a car using a schematic the directions seem quite straight forward in my opinion. I'd order this one again vs the awfully expensive versions available which seem to come from the same continent but have better directions. The directions are not worth the extra several hundred bucks for my situation. 21 circuit might be overkill for a simple muscle car but you can always take wires out. Did buy extra crimp on connectors but it does come with terminations for lights. Gives you alternate wiring diagrams depending on the brand of your vehicle. simple and helpful. Also directions if you are running a single wire GM alternator. Basic stuff but nice they include it.

I installed this 21 circuit universal wiring kit to supplement my engine/tranny swap in my 1954 chevy pickup. Pros Each wire passed my continuity test. Each wire is print labeled The wires are pre bundled into front, engine bay, dash and tail sections. Good quality Great price Product as described Wire lengths acceptable for my use Cons Instructions are vague, but just follow Painless instructions Printed wire label text color is difficult to see without lots of light, but manageable Only two wires were in the wrong bundled section Suggestions Label the end of each wire with the wire number and the name. I used our label maker. Make a master list of wire number, color and name. Laminate the list when finished. Test the continuity of each wire, for obvious reasons. Also, This process will give you a better understanding of the wiring.

Overall good. Just know the orange and white are tied together going into the colum harness. Need to separate them

I installed this in a 1966 F250 with manual everything, so a 12/14: circuit would have been plenty but the price difference was negligible and it's nice to be future proof. Overall it's nice, instructions were surprisingly good. Recommend laying out the harness before install and removing unused wires prior to wrapping and installing. I'm leaving about a foot of unused circuits bundled neatly behind the dash so they're easy to splice into later if needed. Rear section of harness is too short for an 8 foot bed and I think it would be short for a 6 foot bed, too, but was easy to extend with all the leftover wiring removed from the main harness. Definitely money well spent and will use again if I ever need to rewire another.

At first glance this thing looks like it will get the job done. Working on a long term 1953 Buick project and this thing is labeled really nicely, feels as quality as the stuff you get at a parts store and the wires feel like they’ll get the job done. This is my first wiring project but not my first time messing with parts, this feels like a steal at the price point. The parts that do feel low quality you shouldn’t have any issues grafting on better stuff. Are there higher quality parts out there, yes, are we all cheap and gonna get this anyway. Yes.

After I got a good portion of the wiring harness installed, I realize that there were several duplicate wires. Sometimes there was even four of the same wire. The system only requires two. The instructions were not complete and vague to say the least. I finally had to remove the entire harness and buy a new one. I had bought two of these for two different resto mods I was working on. JY. Performance will not take the unused one back because it’s been more than 30 days.

Check wiring into fuse box! Several circuits are in the wrong location. Bundles are not intuitive as to what section they should run to. Instructions are horid so you need to know how to wire a vehicle! More typical Chinese junk! I will make it work thanks to 40 years of experience! Good luck! I do like the labeling, helps with the inadequacies of the kit.

Needed to make a custom harness for my Jeep this was just the ticket! the labels made everything easy. Plenty of wire for everything. Plenty of extra circuits for future accessories as well